function bounce() {
        if(image1.opacity==1){image1.opacity=0}
        image1.opacity+=0.2
        if(150<slider2.value.toFixed() && slider2.value.toFixed()<=200){
            image1.source="./image/xin.png"
        }
        else if(70<slider2.value.toFixed() && slider2.value.toFixed()<=150){
            image1.source="./image/xin_green.png"
        }
        else if(0<=slider2.value.toFixed() && slider2.value.toFixed()<=70){
            image1.source="./image/xin_yellow.png"
        }

}
